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In a pure compound, the mass ratio A:B is 3:10 and the total mass is 52 grams. What is the mass of A?

Answer and explanation

Correct answer: 12 grams

The governing principle is that a pure compound has a definite composition by mass. The stated ratio A:B = 3:10 gives 3 + 10 = 13 total parts. The total mass of those 13 parts is 52 g, so one part weighs 52 ÷ 13 = 4 g. Since A occupies 3 parts, its mass is 3 × 4 = 12 g. Therefore option B is correct. Option A, 40 g, corresponds to the ten parts of B, not the three parts of A. Option C is the total mass of the entire compound, and option D is inconsistent with the ratio. A final check confirms the result: A = 12 g and B = 40 g, their sum is 52 g, and 12:40 simplifies to 3:10. This confirms both the arithmetic and the interpretation of the ratio.

Related tags

ChemistryLaws-Of-Chemical-CombinationMass-RatioClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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